This guide will show you how to play Kayleas an AD carry. This will be short and sweet if you want a pretty guide look else where. This is a guide made for those that want to increase their play style and skill as kayle in regular games.

Greater Mark of Attack Speed x 9 I highly suggest these runes as we'll be building her speed up so she may drop people in seconds.
Greater Seal of Armor x 9 Used for protection early game against other AD carry's
Greater Glyph of Attack Speed x 9 Again attack speed
Greater Quintessence of Life Steal x 3 provide early and late game sustain through out fights.

Ill only be touching on a few and why i chose them everything else should be self explanatory. For her AD carry i went with 24/6/0, why? because there were mastery's in the offensive tree that are just too good to pass up for some extra health or what not in the other trees.
I went back into the offensive tree for Havoc because when you are hitting for 1000 at times that extra 10 damage that Havoc provides can sometimes mean a kill or them getting away.
Tough Skin I chose for those early skirmish's and fights in lane. If 6 minions are attacking you while fighting an enemy champ and each is having their damage reduced by 2, that's 12 damage prevented, i wont go into the math but you can see how this will add up over time in lane fights

The item build is pretty simple.

Starting items
Doran's Blade
or
Boots + Health Potion x 3

Mid game
Berserker's Greaves
Black Cleaver
Black Cleaver
Zeal

Late game
Berserker's Greaves
Black Cleaver
Black Cleaver
Black Cleaver
Phantom Dancer
Infinity Edge

Why do i choose three black cleaver's? because although there unique passives wont start a brand new stack, they will apply all three to that one stack. In one hit you can drop somebodies armor by 45 plus your passive. On top of that the extra 55 attack damage and 30% attack speed make kayle over power tanks and other speed champs like YI and Xin. The phantom dancer is there for the increased movement speed, attack speed, and crit chance. And infinity edge is there for the extra umph of making tanks afraid of you.

Holy Fervor- Kayle's autoattacks against enemy champions reduces their armor and magic resistance by 3% for 5 seconds. This debuff stacks up to 5 times.
This is the main reason that we build 3 black cleaver's, Kayle will Shred anybody's armor she doesnt care who you are.

Reckoning- Blasts a target, dealing magic damage and slowing its movement speed by 35% for 4 seconds. While the target is slowed, Kayle inflicts more damage to the target. Damage increase applies to summoner spells and items used by Kayle

Cooldown: 8 Secs
Range: 650
Cost: 70/75/80/85/90 mana
Magic Damage: 60/110/160/210/260 + (1.0 per AP) + (1.0 per AD)
Damage Amplification: 6/7/8/9/10%

For this build Reckoning is an alright Nuke but what we really want is the 35% speed reduction and the damage amplification. Needless to say that if you are criting for 1000 thats an extra 100 damage from using this spell first.

Divine Blessing- Blesses a target allied champion, healing them and increasing their movement speed for 2.5 seconds.

Cooldown: 15 secs
Range: 1200
Cost: 60/65/70/75/80 mana
Heal: Is pretty unsubstantial what we really want from this is the speed increase
Speed Increase: 15/17/19/21/23%

Use this spell in Conjunction with Reckoning to stay in range of the enemy. Or use Divine Blessing to escape, chase down a target or give your tank and extra gap closer.

Righteous Fury- Kayle harnesses her righteous fury to increase her attack range by 400 (to 525) for 10 seconds. These attacks splash, dealing additional magic damage to her target and nearby units take a percent of her attack damage plus magic damage. Splash and magic damage won't proc when attacking a tower directly.

Cost: 45 mana
Cooldown: 16 seconds
Magic Damage: 20/30/40/50/60 + (.2 per AP)
Splash DMG: 20/25/30/35/40% of attack damage.

Kayles bread and butter spell. This is what you'll use while in team fights, laneing, farming, harrasing,ect.

Intervention- Kayle bathes a target ally champion (or herself) in holy light, rendering them immune to all damage for a few seconds.

Cooldown: 90/75/60 secs
Range: 1200
Cost: 100/75/50 mana
Duration 2/2.5/3 secs

This is kayle's best ability, use it to tower dive, use it to save an ally, use it on your tank in a team fight use it on yourself in the beginning of a 1v1 or 1v2. the reason for this is most champs will blow their abilities early trying to burst you down.

Look im not going to go into which summoner spell you should or shouldnt take, i prefer Flash and Heal some times i switch Heal for Teleport it just depends on your own play style and what you find usefull.